| 1231 | 2-Cyclopentenone2-Cyclopenten-1-0ne, 2-Cyclopenten-1-one, 2-Cyclopentenone-1, 3-Cyclopenten-2-one, CPEO, Cyclopent-2-enone, Cyclopenten-2-one, Cyclopenten-3-one, Cyclopentenone | | Fire Service Act | Type 4 Ignite liquid | Class 2 petroleum Nonaqueous liquid | Handling or storage; Submission of a notification in the case that the amount is 20-100% of the specified value; permit required in the case that the amount is >100% of the specified value (the sum of proportions is calculated when storing/handling multiple classes in the same place) | Fire and Disaster Management Agency | | Fire Service Act |